Don't bother with them, Regardless of what Doenitz says.
The German fighting men won a reputation in WWI ,and to an extent WWII, of not only being very efficiant and deadly soldiers. But also to be rather gentlemanly, Trawlers and fishing boats are of no military value and their meagre tonnage are not worth the stain on your honour.
Plus for practical reasons it's a waste of ammo, And wasting time, fuel, chasing and sinking them instead of searching for proper targets as well as having as much ammunition available to sink them. And last but certainly not least, why have a boat spot you and call you in for 50 tons worth of shipping. That's a lousy deal.
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Because this boat is barely enough for the 50 men we already have. How many would you have rescued, 1? 10? 100? -Kptlt. Willenbrock (film: Das Boot)
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